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21 is a factor of 63 (21 * 3 = 63).

71 is a Prime number.

Since 71 has no common factors with 63, they must be multiplied together to find their least common multiple.

Thus, the least common multiple (LCM) of 21, 63 and 71 is 63 * 71 = 4473.

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Q: What is the LCM of 21 77 and 63?
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